摘要:
莫里青断陷为伊通盆地最南端的一个二级构造单元,古近纪以来经历了张扭、热沉降、压扭和挤压构造演化阶段。烃源岩以双阳组为主,为湖沼环境下的泥岩沉积,有机质丰度较高,有机质类型以腐殖—腐泥过渡的Ⅱ2型为主,Ⅱ1型次之。双阳组泥岩厚度在断陷中心最厚,从西北缘到东南缘,整体减薄;靠山凹陷中心烃源岩有机质水生生物输入占优势,而凹陷边缘以陆源有机质的输入为主;双阳组成熟度比较低,靠山凹陷中心成熟度较高,达到生烃高峰,东部及南部区域只达到生烃门限。
Abstract:
The Moliqing Rift is a second-order tectonic unit of the Yitong Basin. It has experienced four structural evolution stages, i.e. the tenso-shear stage, thermal subsidence stage, compresso-shear stage and compressional stage since Paleogene. The lacustrine muddy Shuangyang Formation is the main source rock of the rift. The organic matter, which is relatively high, mainly belongs to the typeⅡ2, which is of humosapropelic transition, with the type Ⅱ1 as the subordinate. The thickest mudstone of Shuangyang Formation occurs in the center of the rift, which thins from northwestern to southeastern. Aquatic organic matter dominates the source rock in the center, with terrestrial organic matter around the edge of the sag. The maturity of the organic matter in the Shuangyang Formation is relatively low. It is higher in the center of the sag, reaching the peak of the hydrocarbon generation while in the east and the south reaches only the threshold.
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